WO2014181776A1 - ゴム組成物及びそれを用いたタイヤ - Google Patents
ゴム組成物及びそれを用いたタイヤ Download PDFInfo
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- WO2014181776A1 WO2014181776A1 PCT/JP2014/062187 JP2014062187W WO2014181776A1 WO 2014181776 A1 WO2014181776 A1 WO 2014181776A1 JP 2014062187 W JP2014062187 W JP 2014062187W WO 2014181776 A1 WO2014181776 A1 WO 2014181776A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/06—Copolymers with styrene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
- B60C1/00—Tyres characterised by the chemical composition or the physical arrangement or mixture of the composition
- B60C1/0016—Compositions of the tread
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/06—Sulfur
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/17—Amines; Quaternary ammonium compounds
- C08K5/18—Amines; Quaternary ammonium compounds with aromatically bound amino groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/29—Compounds containing one or more carbon-to-nitrogen double bonds
- C08K5/31—Guanidine; Derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
- C08K5/45—Heterocyclic compounds having sulfur in the ring
- C08K5/46—Heterocyclic compounds having sulfur in the ring with oxygen or nitrogen in the ring
- C08K5/47—Thiazoles
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/548—Silicon-containing compounds containing sulfur
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L15/00—Compositions of rubber derivatives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/006—Additives being defined by their surface area
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/86—Optimisation of rolling resistance, e.g. weight reduction
Definitions
- the present invention relates to a rubber composition, and more particularly, to a rubber composition for a tire having excellent wet grip performance and wear resistance and low rolling resistance, and a tire using the same.
- silica is used instead of carbon black.
- the compounding amount of carbon black is relatively reduced, so that the breaking strength and wear resistance of the rubber composition are inevitably lowered.
- silica has a problem that the dispersibility in rubber is poor, the Mooney viscosity of the rubber composition when kneading is increased, and the processability such as extrusion is inferior.
- Patent Documents 1 to 3 for the purpose of obtaining a rubber composition excellent in low fuel consumption and wet grip performance without reducing wear resistance, an inorganic compound powder other than carbon black, silica as a rubber component and a filler is used. There has been proposed a rubber composition for tire treads.
- Patent Documents 1 to 3 need to contain a relatively large amount of inorganic compound powder in order to obtain sufficient effects of improving wet grip performance and fuel consumption. Therefore, a tire rubber composition that is further excellent in the balance of wet grip performance, wear resistance, and low fuel consumption has not been obtained.
- Patent Document 4 discloses wet grip performance by using carbon black specifying properties such as a diene rubber component, silica and properties calculated from a two-dimensional projection image analysis of an aggregate, DBP, N 2 SA, and the like.
- a rubber composition for a tire tread with improved wear resistance has been proposed, but it does not sufficiently satisfy the fuel economy in addition to the wet grip performance and the wear resistance.
- the present invention has been made in view of the above circumstances, and is a rubber composition for a fuel-efficient tire that has excellent wet grip performance and wear resistance using carbon black having a specific property as a reinforcing filler and has low rolling resistance. And a tire using the same.
- a rubber component composed of styrene-butadiene rubber (SBR) or styrene-butadiene rubber (SBR) and butadiene rubber (BR) has a fine particle size with high surface activity. It has been found that the above object can be achieved by blending a specific amount of the carbon black, and the present invention has been completed. That is, according to the present invention, a styrene-butadiene rubber (SBR) or a rubber component composed of styrene-butadiene rubber (SBR) and butadiene rubber (BR) has a hydrogen release rate of at least 0 as a reinforcing filler.
- SBR styrene-butadiene rubber
- SBR styrene-butadiene rubber
- BR butadiene rubber
- N 2 SA nitrogen adsorption specific surface area
- CTAB cetyltributylammonium bromide adsorption specific surface area
- a rubber composition for a fuel-efficient tire having excellent wet grip performance and wear resistance and low rolling resistance, and a tire using the rubber composition can be obtained.
- the rubber composition of the present invention comprises styrene-butadiene rubber (SBR) or a rubber component composed of styrene-butadiene rubber (SBR) and butadiene rubber (BR) with 100 parts by mass of carbon black having a high particle size and high surface activity. 2 to 200 parts by mass based on the above.
- the rubber component used in the present invention include styrene-butadiene rubber (SBR) and butadiene rubber (BR). Styrene-butadiene rubber (SBR) and butadiene rubber (BR) having a butadiene rubber (BR) of 40% by mass or less. ).
- the butadiene rubber is more preferably a modified butadiene rubber in which a functional group highly reactive with carbon black is introduced into an active site in the molecule.
- the modified butadiene rubber is, for example, a modified group and / or a primary group containing at least one selected from a silicon atom, a tin atom, a sulfur atom, an oxygen atom and a titanium atom in any of the polymerization active terminal, the polymerization initiation terminal and the polymerization chain.
- wet grip performance and wear resistance can be improved by blending a novel carbon black having specific characteristics.
- the compounding amount of carbon black is 2 to 200 parts by mass, preferably 5 to 100 parts by mass, and more preferably 5 to 50 parts by mass with respect to 100 parts by mass of the rubber component.
- the wear resistance is deteriorated.
- the blending amount of carbon black exceeds 200 parts by mass, fuel efficiency is deteriorated.
- the carbon black used in the present invention is a novel carbon black having the following characteristics. 1.
- Hydrogen release rate is 0.2% by mass or more, or N 2 SA / CTAB ratio is 1.2-1.5 More preferably, it is a novel carbon black having at least one of the following characteristics.
- Nitrogen adsorption specific surface area (N 2 SA) is 160 to 300 m 2 / g 4).
- Dibutyl phthalate (DBP) absorption is 100-150ml / 100g 5.
- the iodine adsorption specific surface area (IA) is 180 to 300 m 2 / g. 6). Specific coloring power of 120 to 150 7).
- Toluene color permeability is 90 or more
- the hydrogen release rate is as follows. After carbon black dried for 1 hour in a constant temperature dryer at 105 ° C. is cooled to room temperature in a desiccator, it is placed in a tin tube sample container and crimped, sealed, and sealed with a hydrogen analyzer. The amount of hydrogen gas generated when heated at 2000 ° C. for 15 minutes under an argon stream is measured and expressed in mass fraction. When the amount of hydrogen released is large, the wear resistance is improved.
- the nitrogen adsorption specific surface area (N 2 SA) is measured according to JIS K6217-2.
- the nitrogen adsorption specific surface area (N 2 SA) is preferably 160 to 300 m 2 / g, and more preferably 180 to 240 m 2 / g. When N 2 SA is less than 160 m 2 / g, wear resistance deteriorates, and when it exceeds 300 m 2 / g, rolling resistance deteriorates.
- the CTAB adsorption specific surface area is measured according to JIS K6217-3.
- the ratio of the N 2 SA / CTAB specific surface area is preferably 1.2 to 1.5. When the ratio of the N 2 SA / CTAB specific surface area is less than 1.2, the wear resistance is deteriorated. Resistance deteriorates.
- the ratio of the hydrogen release rate and the nitrogen adsorption specific surface area (N 2 SA) to the CTAB adsorption specific surface area N 2 SA / CTAB is an index representing the surface activity characteristics of carbon black.
- the carbon black used in the present invention has these values in the above range.
- the DBP absorption amount is measured according to the JIS K6217-4 oil absorption amount A method.
- the DBP absorption is 100 to 150 ml / 100 g, preferably 110 to 140 ml / 100 g.
- the wear resistance is insufficient.
- the molding processability of the rubber composition is lowered and the dispersibility of the carbon black is deteriorated, the reinforcing performance of the carbon black cannot be sufficiently obtained.
- the DBP absorption exceeds 150 ml / 100 g, the viscosity increases and the workability deteriorates.
- the iodine adsorption specific surface area is measured according to JIS K6217-1.
- the IA is 180 to 300 m 2 / g, preferably 200 to 270 m 2 / g.
- the specific coloring power of the carbon black used in the present invention is 120 to 150, preferably 130 to 140, as measured by the folktron method described in JIS K6217-5.
- the toluene coloring transmittance is measured by the method described in JIS K6218-4, and is preferably 90 or more. If it is less than 90, rolling resistance may deteriorate.
- Carbon black having the above-described characteristics is obtained by using a normal carbon black production apparatus, a raw material supply location, a raw material supply amount, a raw material supply temperature, a fuel oil supply amount, a fuel atomized air supply amount, a combustion air supply amount, It can be manufactured by adjusting the manufacturing conditions such as the combustion air temperature and the reaction stop point.
- wet grip performance is improved by compounding silica.
- silica Any commercially available silica can be used, among which wet silica, dry silica, and colloidal silica are preferably used, and wet silica is particularly preferably used.
- the silica has a BET specific surface area (measured in accordance with ISO 5794/1) of 50 to 300 m 2 / g, preferably 100 to 230 m 2 / g. When the BET specific surface area of silica is less than 50 m 2 / g, the reinforcing property as a filler becomes insufficient and the wear resistance is lowered.
- silica if the BET specific surface area of silica exceeds 300 m 2 / g, it becomes difficult to disperse the silica well, and the effect of improving the wet grip performance cannot be obtained sufficiently.
- the amount of silica is 20 to 130 parts by weight, preferably 50 parts per 100 parts by weight of the diene rubber. ⁇ 130 parts by mass. If the amount of silica is less than 20 parts by mass, the effect of improving wet grip performance cannot be obtained sufficiently. Moreover, when the compounding quantity of a silica exceeds 130 mass parts, abrasion resistance will fall.
- the dispersibility of the silica with respect to the diene rubber can be improved by blending the silane coupling agent with the silica, which is preferable.
- the amount of the silane coupling agent is preferably 3 to 15% by mass, more preferably 4 to 10% by mass, based on the amount of silica.
- the amount of the silane coupling agent is less than 3% by mass, the dispersibility of silica cannot be sufficiently improved.
- the compounding quantity of a silane coupling agent exceeds 15 mass%, silane coupling agents will aggregate and condense and it will become impossible to acquire a desired effect.
- the type of silane coupling agent is not particularly limited, but a sulfur-containing silane coupling agent is preferable.
- the sulfur-containing silane coupling agent include bis- (3-triethoxysilylpropyl) tetrasulfide, bis (3-triethoxysilylpropyl) disulfide, 3-trimethoxysilylpropylbenzothiazole tetrasulfide, and ⁇ -mercapto.
- Examples thereof include propyltriethoxysilane and 3-octanoylthiopropyltriethoxysilane.
- both wet grip performance and wear resistance are provided.
- the total amount of silica and carbon black is 60 to 160 parts by weight, preferably 70 to 140 parts by weight, per 100 parts by weight of the diene rubber.
- the total of silica and carbon black is less than 60 parts by mass, sufficient wet grip performance cannot be obtained.
- the durability of wet grip performance deteriorates and the wear resistance deteriorates.
- the rubber composition of the present invention includes various vulcanizing agents or crosslinking agents, vulcanization accelerators, various inorganic fillers, various oils, anti-aging agents, plasticizers and the like that are generally used for tire rubber compositions.
- Additives can be blended, and these additives can be kneaded by a general method to form a rubber composition, which can be used for vulcanization or crosslinking. As long as the amount of these additives is not contrary to the object of the present invention, a conventional general amount can be used.
- the rubber composition of the present invention can be produced by mixing the above components using a normal rubber kneading machine, such as a Banbury mixer, a kneader, or a roll.
- the pneumatic tire using the tire rubber composition of the present invention can improve wet grip performance, wear resistance, and fuel efficiency more than the conventional level, and is preferably used as a pneumatic tire for various vehicles. be able to.
- Production Examples 1-6 Production of carbon black CB1 to 6 From the upstream part shown in FIG. 1, the first area (not shown): fuel introduction part (inner diameter 680 mm, length 900 mm), second area: raw material introduction part (upstream end inner diameter 435 mm) , Downstream end inner diameter 220 mm, length 1000 mm, taper angle 6.1 °), narrow cylindrical part (inner diameter 220 mm, length 190 mm), third region: reaction continuation and cooling equipped with a quench water pressure spraying device for stopping the reaction
- a carbon black production furnace having a chamber (inner diameter 365 mm, length 1200 mm) is used, and heavy oil shown in Table 1 is used as raw material oil, and carbon blacks of CB1 to 6 are produced according to the operating conditions shown in Table 2. did.
- the properties of the carbon black CB used in the examples and comparative examples were measured and the properties of the rubber compositions obtained were evaluated by the following methods.
- Measurement of CB Iodine adsorption specific surface area Measured according to JIS K6217-1 and expressed in mg / g of iodine adsorbed per unit mass of carbon black.
- N 2 SA adsorption specific surface area Measured according to JIS K6217-2, and expressed as a specific surface area m 2 / g per unit mass of carbon black.
- CTAB adsorption specific surface area Measured in accordance with JIS K6217-3 and displayed as a specific surface area m 2 / g per unit mass of carbon black. 4).
- DBP absorption amount Measured according to JIS K6217-4 oil absorption amount A method, and expressed in ml of dibutyl phthalate (DBP) absorbed per 100 g of carbon black.
- DBP absorption amount Measured according to JIS K6217-4 oil absorption amount A method,
- Abrasion resistance After running 10,000 km on a paved road surface on a real vehicle, measure the remaining groove, and compare the distance traveled to wear the tread 1 mm. Compare the tire of the comparative example with 100 (equivalent to 8000 km / mm). As an index. The larger the value, the better the wear resistance.
- a tire having a size of 195 / 65R15 was produced, and rotated at a speed of 80 km / h by a rotating drum, and the rolling resistance was measured at a load of 4.4 kN.
- the reciprocal of the rolling resistance of the tire of the comparative example was taken as 100 and expressed as an index. The larger the value, the lower the rolling resistance and the lower the fuel consumption.
- Table 3 shows the results of measuring the properties of the carbon blacks CB1 to CB6 used in Examples and Comparative Examples by the above measuring method.
- Examples 1 to 4 and Comparative Examples 1 to 2 Using six types of carbon black shown in Table 3, a rubber composition using only SBR as a rubber component in the formulation according to Table 4 was prepared by kneading with a Banbury mixer. Each obtained rubber composition was evaluated by the above evaluation method. The results are shown in Table 4.
- Examples 5 to 8 and Comparative Examples 3 to 4 Using six types of carbon black shown in Table 3, a rubber composition using SBR and a commercially available butadiene rubber as a rubber component was blended and formulated according to Table 5 and prepared by kneading with a Banbury mixer. Each obtained rubber composition was evaluated by the above evaluation method. The results are shown in Table 5.
- the rubber composition of the present invention using carbon black having a hydrogen release rate within the range of the present invention has a conventional carbon black or a hydrogen release rate outside the range of the present invention. It can be seen that although the fuel efficiency is slightly reduced as compared with the rubber composition used, the wear resistance is improved. In particular, when BR is used as a rubber component and further modified BR is used in combination with SBR, the fuel efficiency is not lowered and the wear resistance is greatly improved.
- the rubber composition of the present invention can be used for automobile tires.
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Abstract
Description
従来から、ゴム補強用充填剤としては、カーボンブラックが使用されている。これは、カーボンブラックがゴム組成物に高い耐摩耗性を付与し得るからであるが、カーボンブラックの単独使用でウェットグリップ性能、耐摩耗性、低燃費性が高いレベルでバランスしたゴム組成物を得ることは困難であり、その改良法としてカーボンブラックの代わりにシリカを配合することが行われている。しかしながら、シリカを充填剤として用いた場合、カーボンブラックの配合量が相対的に減少するため、ゴム組成物の破壊強度、耐摩耗性が低下することは免れないことが分かっている。また、シリカはゴムへの分散性が悪く、混練りを行う際のゴム組成物のムーニー粘度が高くなり、押出しなどの加工性に劣るという問題がある。
即ち、本発明は、スチレン-ブタジエンゴム(SBR)又はスチレン-ブタジエンゴム(SBR)とブタジエンゴム(BR)からなるゴム成分100質量部に対して、補強用充填剤として少なくとも水素放出率が0.2質量%以上及び/又は窒素吸着比表面積(N2SA)とセチルトリブチルアンモニウムブロミド吸着比表面積(CTAB)の比N2SA/CTAB比が1.2~1.5で、窒素吸着比表面積(N2SA)が160~300m2/gであるカーボンブラックを2~200質量部配合したゴム組成物およびそれを用いたタイヤである。
本発明のゴム組成物は、スチレン-ブタジエンゴム(SBR)又はスチレン-ブタジエンゴム(SBR)とブタジエンゴム(BR)からなるゴム成分に表面活性の高い微粒径のカーボンブラックをゴム成分100質量部に対して2~200質量部配合してなることを特徴とするものである。
本発明に用いられるゴム成分としては、スチレン-ブタジエンゴム(SBR)、ブタジエンゴム(BR)が挙げられ、ブタジエンゴム(BR)が40質量%以下のスチレン-ブタジエンゴム(SBR)とブタジエンゴム(BR)からなることが好ましい。さらに、ブタジエンゴムは分子内の活性部位にカーボンブラックとの反応性の高い官能基が導入された変性ブタジエンゴムであることがより好ましい。変性ブタジエンゴムとは、例えば重合活性末端、重合開始末端及び重合鎖中のいずれかにケイ素原子、スズ原子、硫黄原子、酸素原子及びチタン原子から選ばれる少なくとも1つを含む変性基及び/又は一級アミン、二級アミン、三級アミン及び環状アミンから選ばれる構造を含む変性基を有するブタジエンゴムである。
1.水素放出率が0.2質量%以上、または
2. N2SA/CTABの比が1.2~1.5
さらに好ましくは、次のような特性のうち少なくとも1つの特性を有する新規のカーボンブラックである。
3.窒素吸着比表面積(N2SA)が160~300m2/g
4.ジブチルフタレート(DBP)吸収量は、100~150ml/100g
5.沃素吸着比表面積(IA)は、180~300m2/g
6.比着色力が120~150
7.トルエン着色透過度が90以上
窒素吸着比表面積(N2SA)は、JIS K6217-2に準拠して、測定する。
窒素吸着比表面積(N2SA)は、160~300m2/gであることが好ましく、さらに180~240m2/gであることが好ましい。N2SAが160m2/g未満であると、耐摩耗性が悪化し、300m2/gを超えると転がり抵抗が悪化する。
N2SA/CTAB比表面積の比は、1.2~1.5が好ましく、N2SA/CTAB比表面積の比が1.2未満では耐摩耗性が悪化し、1.5より大きいと転がり抵抗が悪化する。
DBP吸収量が、100~150ml/100gであり、好ましくは110~140ml/100gである。DBP吸収量が100ml/100g未満であると耐摩耗性が不足する。またゴム組成物の成形加工性が低下し、カーボンブラックの分散性が悪化するのでカーボンブラックの補強性能が十分に得られない。DBP吸収量が150ml/100gを超えると、粘度が高くなり加工性が悪化する。
IAは、180~300m2/g、好ましくは200~270m2/gである。
また、本発明で使用するカーボンブラックの比着色力は、JIS K6217-5に記載のフォークトロン法で測定し、120~150であり、好ましくは、130~140である。
そして、トルエン着色透過度は、JIS K6218-4に記載の方法で測定し、90以上が好ましく、90未満の場合転がり抵抗が悪化する恐れがある。
このようなシリカとしては東ソーシリカ社製、商品名「ニプシルAQ」(BET比表面積=190m2/g)、デグサ社製商品名「ウルトラジルVN3」(BET比表面積=175m2/g)等の市販品を用いることができる。シリカは1種を単独で用いてもよく、2種以上を組み合わせて用いてもよい。
本発明のタイヤに使用されるゴム組成物において、低発熱性、耐摩耗性を満足させるためには、シリカの配合量は、ジエン系ゴム100質量部に対し20~130質量部、好ましくは50~130質量部にする。シリカの配合量が20質量部未満では、ウェットグリップ性能を改良する効果が十分に得られない。またシリカの配合量が130質量部を超えると、耐摩耗性が低下する。
本発明のゴム組成物は、通常のゴム用混練機械、例えば、バンバリーミキサー、ニーダー、ロール等を使用して、上記各成分を混合することによって製造することができる。
カーボンブラックCB1~6の製造
図1に示す上流部より、第一領域(図示せず):燃料導入部(内側直径680mm、長さ900mm)、第二領域:原料導入部(上流端内側直径435mm、下流端内側直径220mm、長さ1000mm、テーパー角6.1°)、狭小円筒部(内側直径220mm、長さ190mm)、第三領域:反応停止用急冷水圧噴霧装置を備えた反応継続兼冷却室(内側直径365mm、長さ1200mm)を有するカーボンブラック製造炉を用い、原料油として表1に示した重質油を使用し、表2に示した操作条件によりCB1~6のカーボンブラックを製造した。
変性ブタジエンゴム(変性BR)の製造
乾燥し、窒素置換された800mLの耐圧ガラス容器に、1,3-ブタジエン60gのシクロヘキサン溶液(20質量%)、2,2-ジテトラヒドロフリルプロパン0.70mmolを加え、さらに、n-ブチルリチウム(BuLi)0.70mmolを加えた後、50℃の温水浴中で1.5時間重合反応を行った。この重合転化率はほぼ100%である。
その後、重合系に、四塩化スズ(SnCl4)0.20mmolを加えて30分変性反応を行った。最後に重合反応系に、2,6-ジ-t-ブチル-p-クレゾール(BHT)のイソプロパノール5質量%溶液2mLを添加し、反応を停止させた。その後、真空乾燥して変性BRを得た。
得られた共重合体は、重量平均分子量10万である。
CBの測定
1.沃素吸着比表面積
JIS K6217-1に準拠して測定し、カーボンブラック単位質量当たりのヨウ素の吸着量mg/gで表示する。
2.N2SA吸着比表面積
JIS K6217-2に準拠して、測定し、カーボンブラック単位質量当たりの比表面積m2/gで表示する。
3.CTAB吸着比表面積、
JIS K6217-3に準拠して、測定し、カーボンブラック単位質量当たりの比表面積m2/gで表示する。
4.DBP吸収量
JIS K6217-4吸油量A法に準拠して、測定し、カーボンブラック100g当たりに吸収されるジブチルフタレート(DBP)の体積mlで表示する。
JIS K6217-5に記載のフォークトロン法で測定する。
6.トルエン着色透過度
JIS K6218-4に記載の方法で測定し、純粋なトルエンと比較した百分率で表される。
7.水素放出率
1)カーボンブラック試料を105℃の恒温乾燥器中で1時間乾燥し、デシケータ中で室温まで冷却する。
2)スズ製のチューブ状サンプル容器に約10mgを精秤し、圧着、密栓する。
3)水素分析装置(堀場製作所EMGA621W)でアルゴン気流下、2000℃で15分加熱した時の水素ガス発生量を測定し、質量分率を求める。
実車にて、舗装路面を1万km走行後、残溝を測定し、トレッドが1mm摩耗するのに要する走行距離を相対比較し、比較例のタイヤを100(8000km/mmに相当)として、指数表示した。数値が大きい程、耐摩耗性が良好なことを示す。
サイズ195/65R15のタイヤを作製し、回転ドラムにより、80km/hの速度で回転させ、荷重4.4kNとして、転がり抵抗を測定した。比較例のタイヤの転がり抵抗の逆数を100として、指数表示した。数値が大きい程、転がり抵抗が低く、低燃費性であることを示す。
粘弾性測定装置(レオメトリックス社製)を使用し、温度0℃、歪み1%、周波数15Hzで損失正接tanδを測定した。比較例の数値を100として指数表示した。数値が大きい程、ウェットグリップ性能が良好なことを示す。
表3に示す6種類のカーボンブラックを用いて、表4に従う配合処方でゴム成分としてSBRのみを使用したゴム組成物をバンバリーミキサーにて混練して調製した。
得られた各ゴム組成物を上記の評価方法により評価した。結果を表4に示す。
表3に示す6種類のカーボンブラックを用いて、表5に従う配合処方でゴム成分としてSBRと市販のブタジエンゴムを使用したゴム組成物をバンバリーミキサーにて混練して調製した。
得られた各ゴム組成物を上記の評価方法により評価した。結果を表5に示す。
表3に示す6種類のカーボンブラックを用いて、表6に従う配合処方でゴム成分としてSBRと製造例7で製造した変性ブタジエンゴムを使用したゴム組成物をバンバリーミキサーにて混練して調製した。
得られた各ゴム組成物を上記の評価方法により評価した。結果を表6に示す。
1:SBR#1500(JSR社製)
2:BR NF35R(旭化成社製)
3:製造例7で製造したもの
4:ニプシルAQ(東ソーシリカ社製)
5:Si69(ビス(3-トリエトキシシリルプロピル)テトラスルフィド、EVONIK Industries社製)
6:ノックラック6C(N-(1,3-ジメチルブチル)-N‘-フェニル-p-フェニレンジアミン、大内新興化学工業社製)
7:ノックセラーD(ジフェニルグアニジン、大内新興化学工業社製)
8:ノックセラーDM-P(ベンゾチアジルジスルフィド、大内新興化学工業社製)
9:ノックセラーNS-P(N-t-ブチル-2-ベンゾチアジルスルフェンアミド、大内新興化学工業社製)
Claims (7)
- スチレン-ブタジエンゴム、またはスチレン-ブタジエンゴムとブタジエンゴムからなるゴム成分100質量部に対して、補強用充填剤として少なくとも水素放出率が0.2質量%以上、かつ窒素吸着比表面積N2SAが160~300m2/gであるカーボンブラックを2~200質量部配合したことを特徴とするゴム組成物。
- スチレン-ブタジエンゴム、またはスチレン-ブタジエンゴムとブタジエンゴムからなるゴム成分100質量部に対して、補強用充填剤として少なくとも窒素吸着比表面積N2SAとセチルトリブチルアンモニウムブロミド吸着比表面積CTABの比N2SA/CTABが1.2~1.5、かつ窒素吸着比表面積が160~300m2/gであるカーボンブラックを2~200質量部配合したことを特徴とするゴム組成物。
- カーボンブラックの水素放出率が0.2質量%以上および窒素吸着比表面積N2SAとセチルトリブチルアンモニウムブロミド吸着比表面積CTABの比N2SA/CTAB比が1.2~1.5である請求項1に記載のゴム組成物。
- ゴム成分におけるブタジエンゴムの含有量が40質量%以下である請求項1~3のいずれかに記載のゴム組成物。
- ゴム成分におけるブタジエンゴムが変性ブタジエンゴムである請求項1~4のいずれかに記載のゴム組成物。
- カーボンブラックの配合量がゴム成分100質量部に対し2~50質量部である請求項1~5のいずれかに記載のゴム組成物。
- 請求項1~6のいずれかに記載のゴム組成物を用いたタイヤ。
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| US14/888,150 US9873778B2 (en) | 2013-05-07 | 2014-05-02 | Rubber composition and tire using the same |
| EP14794229.6A EP2995645B1 (en) | 2013-05-07 | 2014-05-02 | Rubber composition and tire using the same |
| JP2015515873A JP6397816B2 (ja) | 2013-05-07 | 2014-05-02 | ゴム組成物及びそれを用いたタイヤ |
| CN201480025875.5A CN105189635B (zh) | 2013-05-07 | 2014-05-02 | 橡胶组合物和使用其的轮胎 |
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Cited By (3)
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| US20160130417A1 (en) * | 2013-05-24 | 2016-05-12 | Bridgestone Corporation | Rubber composition |
| JP2020019835A (ja) * | 2018-07-30 | 2020-02-06 | 住友ゴム工業株式会社 | ゴム組成物及び空気入りタイヤ |
| WO2023008105A1 (ja) * | 2021-07-30 | 2023-02-02 | 株式会社ブリヂストン | タイヤトレッド用ゴム組成物、及びタイヤ |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107345008A (zh) * | 2017-09-15 | 2017-11-14 | 苏州英得福机电科技有限公司 | 一种耐磨性橡胶材料 |
| ES3060888T3 (en) * | 2018-07-27 | 2026-03-30 | Add Ventures Capital International Company Ltd | Recovered carbon black and composite material comprising said recovered carbon black |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP2995645B1 (en) | 2018-07-04 |
| JPWO2014181776A1 (ja) | 2017-02-23 |
| CN105189635B (zh) | 2018-04-06 |
| EP2995645A1 (en) | 2016-03-16 |
| JP6397816B2 (ja) | 2018-09-26 |
| EP2995645A4 (en) | 2016-04-27 |
| CN105189635A (zh) | 2015-12-23 |
| US9873778B2 (en) | 2018-01-23 |
| US20160053098A1 (en) | 2016-02-25 |
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